DTMF decoding sithe DTMF decoder and interfacing with AT89s52

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nyxon

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hey!!
i am tried to decode a DTMF tone by using a decoder chip then i send it to the microcontroller at89s52 and then display the output in the lcd but when the key on the telephone set is pressed 1 only one time, the no. 1 keeps on displaying repeatedly on the lcd...how do i solve it??
plz help!!
 

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